Computers use multiple DC voltages, and the power adapter is the external part of the power supply for a laptop. The additional DC voltages are created by internal circuits. Desktop computer power ...
or 45W/85W MagSafe Power Adapters, allowing those external displays and power adapters to charge a MacBook Pro or MacBook Air equipped with MagSafe 2. The adapter was priced at $9.99 on Apple's ...
Thankfully, companies like Plugable offer ways to push past external display ... laptop while 10W is used to power the dock. Get the DisplayLink Pro Quad Display Adapter for $124.95 from Plugable.